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Chapter 8. HTML Reference > Attribute Value Types

8.1. Attribute Value Types

Many element attributes share similar data requirements. For the sake of brevity in the reference listings, this section describes a few common attribute value types in more detail than is possible within each listing. Whenever you see one of these attribute value types associated with an attribute, consult this section for a description of the type.

8.1.1. Length

A length value defines a linear measure of document real estate. The unit of measurement can be any applicable unit that helps identify a position or space on the screen. HTML attribute length units are uniformly pixels, but in other content, such as that specified in Cascading Style Sheets (see Chapter 9), measurements can be in inches, picas, ems, or other relevant units. A single numeric value may represent a length when it defines the offset from an edge of an element. For example, a coordinate point (10,20) consists of two length values, denoting pixel measurements from the left and top edges of an element, respectively.


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